EP1953680A2 - Dispositif biométrique pour la lecture d'empreintes digitales et son procédé d'utilisation - Google Patents

Dispositif biométrique pour la lecture d'empreintes digitales et son procédé d'utilisation Download PDF

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Publication number
EP1953680A2
EP1953680A2 EP08150730A EP08150730A EP1953680A2 EP 1953680 A2 EP1953680 A2 EP 1953680A2 EP 08150730 A EP08150730 A EP 08150730A EP 08150730 A EP08150730 A EP 08150730A EP 1953680 A2 EP1953680 A2 EP 1953680A2
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EP
European Patent Office
Prior art keywords
sensors
sensor
fingertip
code
minutiae
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08150730A
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German (de)
English (en)
Other versions
EP1953680A3 (fr
Inventor
Ugo Nais
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alluser Industrie Srl
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Alluser Industrie Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alluser Industrie Srl filed Critical Alluser Industrie Srl
Publication of EP1953680A2 publication Critical patent/EP1953680A2/fr
Publication of EP1953680A3 publication Critical patent/EP1953680A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1335—Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement

Definitions

  • the present invention relates to a biometric device for reading a fingerprint.
  • the invention also relates to a particular method of use of such biometric device.
  • a generic biometric device verifies the identity and recognizes a person on the basis of biological features.
  • Each user is subjected initially to an initial registration operation, known as enrollment, during which a copy of his fingerprint is acquired; its discriminating features, extracted by means of specialized image processing algorithms, constitute the model of the user.
  • the image of the fingerprint is processed to extract the characteristic information that forms the so-called template, which can be defined as a mathematical representation of the biometric data.
  • the template can be recorded in a centralized database or on a personal smart card of the user.
  • Devices for reading a fingerprint are currently known which are based on the use of an electronic swipe sensor, on which the finger is made to slide in order to acquire the fingerprint.
  • This type of false negative recognitions therefore entails an inconvenience for the user, who is asked to repeat the operation several times in order to be able to acquire an image of the fingerprint which matches the stored image.
  • the aim of the present invention is to provide a biometric device for reading a fingerprint which is capable of obviating the cited drawbacks of similar known types of device.
  • an object of the present invention is to provide a biometric device which is capable of a more accurate reading of the fingerprint, with a consequent reduced risk of false negative recognitions and therefore with higher reliability.
  • Another object of the present invention is to provide a biometric device which is simple to use, like similar known types of device.
  • Another object of the present invention is to provide a biometric device which can be associated with other known types of security device.
  • Another object of the present invention is to provide a biometric device for reading a fingerprint which can be manufactured with known systems and technologies.
  • a biometric device for reading a fingerprint characterized in that it comprises, within an ergonomic holder, at least two swipe sensors which are arranged side by side and are staggered and inclined so as to form a recess in which a fingertip is slid in order to read its print.
  • a biometric device for reading a fingerprint is generally designated by the reference numeral 10.
  • the device 10 comprises, inside an ergonomic holder 11, two swipe sensors 12 and 13 which are substantially flat and are arranged close to each other along one of their long sides 12a and 13a respectively, and are staggered and inclined so as to form a V-shaped recess, clearly shown in Figure 2 , in which a fingertip 14 can be slid in order to read its print.
  • the ergonomic holder 11 described here by way of example is constituted by a concave element which has a substantially V-shaped cross-section; in particular, said concave element has a first substantially V-shaped transverse cross-section, shown in Figure 4 , in which the side 11a on which the first sensor 12 lies is longer and slightly less inclined than the other side 11b; a second central transverse cross-section, shown in Figure 5 , in which the two facing sides 11c and 11b have the same length and inclination and between them there is an interposed flat portion 11d; and a third transverse cross-section, which is also V-shaped and is shown Figure 6 and in which the side 11e on which the second sensor 13 lies is longer and slightly less inclined than the facing side 11c.
  • the two sensors 12 and 13 can therefore be more or less spaced in a longitudinal direction by interposing a central portion 11d.
  • the two sensors 12 and 13 can be for example of the capacitive type and also of the RF or ultrasound type or provided by means of similar technologies suitable for the same purpose.
  • the two sensors 12 and 13 are arranged on planes which are inclined substantially symmetrically with respect to the vertical longitudinal plane of symmetry of the holder 11.
  • the two sensors staggered in space allow to obtain two images which represent different regions of the same fingertip 14, with a common overlap area, instead of a single image, which in any case is limited in its dimensions by the use of a single sensor and therefore by the width of the sensitive area of said individual sensor.
  • the biometric device by using one or more associated microprocessors and specific algorithms, reconstructs the image thus acquired in order to obtain a clear and unequivocal data item which identifies the person.
  • the use of a plurality of electronic sensors arranged appropriately to acquire biometric data entails a preprocessing step to realign the images obtained from the two sensors in order to obtain a unique and univocal image.
  • the image obtained from the system described here is therefore a set of images of the same detail taken from different angles, a first image captured by a first sensor 12 and a second image captured by a second sensor 13.
  • the system thus described does not require a very heavy reprocessing in terms of the algorithms used to treat the images, since as already mentioned the images remain separate, it allows to speed up the recognition operation, increasing the probabilities of recognizing the subject immediately or in any case in a shorter average time than similar known types of device.
  • the storage of the resulting double image allows to store the position of the recognized minutiae by means of a suitable algorithm which attributes to the minutiae spatial coordinates which can be mapped as geographical locations or as the vertices of a polygon.
  • the size of the data to be saved is reduced significantly and the data can thus be stored easily on a smart card, memory card or other magnetic or optical media or transponders for one-to-one identification.
  • the data item thus reprocessed and saved on a medium which as mentioned can be a smart card, in itself is no longer a biometric sensitive data item, since it is merely a series of spatial coordinates which must be compared with a suitable subset of the map of minutiae identified during the acquisition of an image which represents the biometric data item of the fingerprint.
  • the operation of the device 10 according to the invention is as follows.
  • the invention therefore relates also to this particular method of use of the device 10, shown by way of example in Figure 7 : if the user swipes his finger on the two sensors 12 and 13 a first time in a first direction, a second time in the same direction and a third time in the opposite direction, we have identified the numeral 1 in binary code; with similar sequences, such as the ones shown in Figure 7 , it is possible to define more or less complex codes, which can be used without having to resort to additional alphanumeric keypads, which would compromise the typical compactness of these biometric devices for reading fingerprints.
  • control system is capable of recognizing a state which is different from transit, indeed because it is not possible to determine the swiping direction as the time sequence between the acquired images, which is typical and identifies an object which moves over sensors, does not occur.
  • the code determined by the sequence of passes over the two sensors is entered into the control system associated with the device 10 by means of a series of consecutive swipes which have suitable pauses between them so that the microprocessor recognizes a new pass with respect to the preceding one.
  • the storage of the sequence of the directions in which the subsequent passes over the two sensors are performed is none other than a binary representation which determines the access PIN or code; such code is saved and stored together with the biometric data item (image), thus allowing to increase the degree of security of the access system.
  • This system in addition to associating the biometric data item with a user, in this particular case the map of a subset of minutiae, also associates therewith a secret code or PIN which is entered into the system by using the biometric data item itself, which is used no longer as a "data item” but as a means for entering a recognition code.
  • the need to swipe the finger many times over the acquisition area allows the system to acquire a series of images of such biometric data item, reducing on the one hand the possibility of false recognitions or mistakes and at the same time ensuring a higher degree of security of the system.
  • the present invention provides a biometric device capable of a more accurate reading of the fingerprint, with a consequent reduced risk of false negative recognitions and therefore with higher reliability.
  • the present invention provides a biometric device which is simple to use, like similar known types of device, since it is sufficient to swipe thereon a fingertip one or more times.
  • the present invention provides a biometric device which can be associated with other known types of security device but can also be used to determine an additional recognition code, for example of the binary type, by swiping a fingertip several times on it in one direction or in the opposite direction a preset number of times.
  • the present invention provides a biometric device for reading a fingerprint which can be manufactured with known equipment and technologies.
  • the materials employed may be any according to requirements and to the state of the art.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Collating Specific Patterns (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
EP08150730A 2007-02-01 2008-01-28 Dispositif biométrique pour la lecture d'empreintes digitales et son procédé d'utilisation Withdrawn EP1953680A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000032A ITPD20070032A1 (it) 2007-02-01 2007-02-01 Dispositivo biometrico per la lettura di una impronta digitale e metodo d'impiego

Publications (2)

Publication Number Publication Date
EP1953680A2 true EP1953680A2 (fr) 2008-08-06
EP1953680A3 EP1953680A3 (fr) 2010-07-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08150730A Withdrawn EP1953680A3 (fr) 2007-02-01 2008-01-28 Dispositif biométrique pour la lecture d'empreintes digitales et son procédé d'utilisation

Country Status (2)

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EP (1) EP1953680A3 (fr)
IT (1) ITPD20070032A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011100086A1 (de) 2010-04-30 2011-12-08 Leopold Gallner Fingerscanner welcher an einer vertikalen Fläche variabel anordenbar ist

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999043258A1 (fr) * 1998-02-26 1999-09-02 Idex As Detecteur d'empreintes
US7136514B1 (en) * 2002-02-14 2006-11-14 Wong Jacob Y Method for authenticating an individual by use of fingerprint data

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999043258A1 (fr) * 1998-02-26 1999-09-02 Idex As Detecteur d'empreintes
US7136514B1 (en) * 2002-02-14 2006-11-14 Wong Jacob Y Method for authenticating an individual by use of fingerprint data

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Davide Maltoni, Dario Maio, Anil Jain, Salil Prabhakar: "Handbook of Fingerprint Recognition" June 2003 (2003-06), Springer , United States0-387-95431-7 , XP002576729 * p. 54, 55, 68, 69, 135 * *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011100086A1 (de) 2010-04-30 2011-12-08 Leopold Gallner Fingerscanner welcher an einer vertikalen Fläche variabel anordenbar ist

Also Published As

Publication number Publication date
EP1953680A3 (fr) 2010-07-14
ITPD20070032A1 (it) 2008-08-02

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